2012-05-01: Support was added for Waymarked Trails. (Other news...)
Links to Wikimedia projects for multiple language variants.
Fragment of a discussion from Template talk:Portal
I think be/be-tarask is the only situation in which a different way of writing the same language has actually led to different Wikipedias. Feel free to find a solution for the link, but it's such a small edge case that I will not look into trying to address the issue you raised.
